Nowadays, more and more students start their primary education in combined classrooms consisting of students of two or more school classes. Such types of classrooms are rich in special features that need attention. There are a minimum of two and a maximum of four classes in the classroom. The teacher conducts the educational process for all students at the same time, and the students perform the given activities alone or with the help of the teacher. It is very important to create the best possible atmosphere in the classroom, as it greatly contributes to the success of teaching. Furthermore, the teacher has a very complex task, therefore his competencies are of the utmost importance. It guides students through the educational process and helps them develop the abilities and skills needed for life. Furthermore, the teacher prepares and plans classes in combined classrooms which is very demanding and exhaustive. The fact is that such classes are often insufficiently materially equipped, without the necessary teaching and didactic materials and teaching resources. Despite this, students in combined classrooms very quickly build friendly and cooperative relationships and are trained for independent learning. As in any class, in combined classes it is important to build a partnership between the school and parents, so that students from this example realize the importance of positive relationships and mutual cooperation. Many people consider combined classrooms a "necessary evil" not knowing how much benefit they provide to the teacher, but also to the students. Since schools with such classes are often located in small, rural areas, it is much easier for teachers to organize off classroom activities and thus contribute to the interestingness of the educational process. This thesis invites all teachers and those who are about to become so to think differently about the combined classrooms and the educational process that takes place in them.